CN103650562A - Method and arrangement related to interference between systems - Google Patents
Method and arrangement related to interference between systems Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/04—Error control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/18—Negotiating wireless communication parameters
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Abstract
Methods and arrangements for use in a respective node and mobile terminal in a first system associated with a first frequency band for radio communication, for supporting avoiding or reducing interference in a second frequency band associated with a second system, which second frequency band is adjacent to the first frequency band. The method for use in the node comprises detecting activity of the second system in the second frequency band and adjusting the bandwidth used by the node for communication, based on characteristics of the detected current activity of the second system in the second frequency band, such that interference to the second frequency band, from radio communication associated with the node, is adapted to the second system activity in said second frequency band. The method further comprises providing information of said adjustment to at least one mobile terminal. Further, information of said adjustment could be provided to neighboring nodes.
Description
Technical field
The present invention relates to method and layout for the processing of the interference between the system using adjacent frequency band.
Background technology
Modern Communication System (such as for example UMTS(Universal Mobile Telecommunications System), LTE(Long Term Evolution) and LTE-A(senior)) produce than previous " leaving over " communication system (such as for example, GSM(global system for mobile communications)) the significantly higher outer amount of disturbing of the band to adjacent frequency band.The outer interference of such band is also known as " disturb and leak " sometimes.The outer main cause of disturbing of this band is that modern system typically adopts the bandwidth larger or wider than Legacy System, and the relatively narrow more difficult exploitation of bandwidth of relatively large bandwidth ratio can be removed the filter of the outer transmitting of band.
The band of the amount that this is significantly higher is outer to be disturbed or transmitting for example can cause the infringement of the adjusting of the interference about other system is caused, the frequency band of the frequency band vicinity that these other system employings and interfere generation or " upset " system adopt.Use is adjacent to or expects to be adjacent to the frequency band of the frequency band that for example UMTS, LTE in some countries and LTE-A use and therefore to stand from the example of the system of the interference band of these systems outside:
Radionavigation between-aircraft and ground and communication system, for example DME(distance measuring equipment) (962-1213 MHz) and following L-DACS(L wave band numeral aviation communication system) (960-1164 MHz)
-for the communicate by letter/control system GSM-R(railway with train communication and control train) (in Europe, being 873-880/918-925 MHz).
For example, in Europe, LTE system can be used 900,1800 and/or 2600 MHz wave bands.Therefore, for example, the LTE system DL(down link in 900 MHz frequency bands) transmitting can be to for causing interference with for example aircraft communication and DME or the intrasystem transmission of L-DACS of controlling aircraft.Such scene illustrates in Fig. 1.Therefore,, in the scene of worst condition, the outer interference of band transmitting from LTE DL can for example interrupt or upset important aircraft control command.
Propose a plurality of solutions and alleviated the interference between the system of using adjacent frequency band.Great majority in the solution of these propositions focus on and cause with the use of (static state) the low delivering power in the system of outer interference or focus in the use of the fixing what is called " protection wave band " between the adjacent frequency band being used by different system or operator.Protection wave band means and is not used in communication and as the frequency band by adopting the buffering of the outer interference of band causing around the system of the frequency band of protection wave band.The frequency band protection wave band wider, just need to be wider that system is used is avoided the interference between system.
Yet; the prior art solution that these propose can cause for example covering problem when (static state) delivering power is too low, and in radio resource use, may be for example also inefficient due to the use of the unnecessary large protection wave band based on worst condition scene.In addition, bandwidth is very valuable scarce resource for controlling the corresponding management mechanism of the frequency spectrum in each country or tissue.Therefore,, at least for reason economically, between the system of using adjacent frequency band, retaining wide protection wave band is not attractive idea.
Summary of the invention
The improved processing of obtaining the interference between the system of using adjacent frequency band can be desirable.Target of the present invention is allow to use the improved processing of the interference between the system of adjacent frequency band.Other target of the present invention is to provide efficient method and arranges and avoid or reduce from the first system to the interference of using the second system of adjacent frequency band.
According to first aspect, the method of carry out/being carried out by this node in the node with for the associated the first system of the first frequency band of radio communication is provided, so that avoid or the second frequency band that minimizing is associated with second system in interference, this second frequency band is adjacent to the first frequency band.The method comprises the activity of the second system detecting in the second frequency band and determines the characteristic of the current active of the second system in the second frequency band.The method also comprises based on described characteristic adjusts the bandwidth for radio communication by node, so that the second system that the interference from the radio communication associated with node to the second frequency band is adapted to described the second frequency band is movable.The information that provides bandwidth to adjust at least one mobile terminal of being served by this node is also provided the method.
According to second aspect, the layout of using in the node with for the associated the first system of the first frequency band of radio communication is provided so that avoid or the second frequency band that minimizing is associated with second system in interference, this second frequency band is adjacent to the first frequency band.This layout comprises the movable functional unit that is adapted to the second system in detection the second frequency band.This layout also comprises the functional unit that is adapted to the characteristic of determining the second system current active in the second frequency band.In addition, this layout comprise be adapted to based on described characteristic adjust by node for the bandwidth of communicating by letter so that the interference of the second frequency band is adapted to the functional unit of the second system activity of described the second frequency band.This layout also comprises being adapted to at least one mobile terminal of being served by this node to be provided information about bandwidth adjustment, therefore allows described at least one mobile terminal to continue serviced functional unit.
According to the third aspect, as mentioned above, provide method of carry out/being carried out by this mobile terminal in the mobile terminal in the first system associated with the first frequency band etc.The method comprises from the node of service mobile terminal and receiving about the information for the adjustment of the bandwidth of communicating by letter by described node, and the information based on received is carried out adaptive at least one parameter about channel estimating.
According to fourth aspect, as mentioned above, provide the layout of using in the mobile terminal in the first system associated with the first frequency band.This layout comprises being adapted to and receives the functional unit for the information of the adjustment of the bandwidth of communicating by letter about the node by service mobile terminal.This layout also comprises the functional unit of next adaptive at least one parameter about channel estimating of information being adapted to based on received.
Above method and layout provide following advantage: can be by only taking suitable action avoid or reduce for example from mobile system BS(base station/eNB in time and the position of needs) and/or UE(subscriber equipment) interference of serving to neighbor systems, and do not sacrifice more than necessary bandwidth and/or delivering power, and avoid the interference from mobile system BS to adjacent service and be not created on the problem the UE measuring in affected community.In addition, the size of temporary protection wave band can be greater than the size of utilizing current solution possible.Can use about disturbing the multidate information of scene, and can avoid unnecessary worst condition supposition and can minimize the constraint to EVAC (Evacuation Network Computer Model).Can by being chosen as, on-the-fly modifying of EVAC (Evacuation Network Computer Model) will minimize the alternative approach that for example QoS of EVAC (Evacuation Network Computer Model) declines according to certain objective function.
Above method and layout can realize in different embodiment.For example, about the information of bandwidth adjustment, can comprise with lower one or more: the designator of the Measurement bandwidth of the permission of the mobile terminal that the bandwidth based on adjusting is selected; The designator for the bandwidth of communicating by letter by node after bandwidth adjustment; And the designator of the absolute or relative changes in bandwidth.The standard that also can comprise in certain embodiments, following one or more position about the information of bandwidth adjustment: the Measurement bandwidth of permission; After adjusting, by node, be used for the bandwidth of communicating by letter; And will no longer by node, be used for the frequency band of communicating by letter after bandwidth adjustment.
Information about bandwidth adjustment also can offer at least one neighbor node, so that described neighbor node can provide the information of adjusting about bandwidth at least one mobile terminal of being served by described neighbor node, therefore allow described at least one mobile terminal to continue serviced.
In adaptive at least one parameter about channel estimating according to the method aspect third and fourth and in arranging, can be with lower one or more: mobile terminal is carried out the Measurement bandwidth for the measurement of channel estimating; And the position of Measurement bandwidth.
According to the 5th aspect, the network node using in cellular communication system is provided, described network node comprises the layout according to second aspect.
According to the 6th aspect, the mobile terminal using in cellular communication system is provided, described mobile terminal comprises the layout according to fourth aspect.
Above embodiment is mainly described aspect method.Yet above description is also intended to the embodiment that comprises layout and network node/mobile terminal, it is adapted to the performance that allows feature described above.Can be according to demand, requirement or preference and combine in a different manner the different characteristic of above one exemplary embodiment.
Accompanying drawing explanation
To utilize now one exemplary embodiment and describe in more detail the present invention with reference to accompanying drawing, in accompanying drawing:
The scene that Fig. 1 diagram can for example, be disturbed with other system (, the control system of aircraft and train) according to the cellular communication system of prior art.
Fig. 2 a is the figure that idealized system frequency spectrum (thick line) and real system frequency spectrum (fine rule) are shown.
Fig. 2 b illustrates according to the band compared to shown in Fig. 2 of one exemplary embodiment to disturb the improved band of (fine line) to disturb the figure of the example of (dotted line and chain-dotted line) outward outward.
Fig. 3 illustrates desirable conveyer frequency spectrum (thick line) in the first system A and the figure of the desirable receiver frequency spectrum (dotted line) in second system B.
Fig. 4 a-Fig. 4 c is that (Fig. 4 is the figure to the inter-system interference of the actual receiver of second system B a) and according to the actual conveyer from the first system A of different one exemplary embodiment (Fig. 4 b-Fig. 4 c) according to prior art for diagram.
Fig. 5 a-Fig. 5 c is that (Fig. 5 is the figure to the inter-system interference of the desirable receiver of second system B a) and according to the actual conveyer from the first system A of different one exemplary embodiment (Fig. 5 b-Fig. 5 c) according to prior art for diagram.
Fig. 6 a-Fig. 6 c is that (Fig. 6 is the figure to the inter-system interference of the actual receiver of second system B a) and according to the desirable conveyer from the first system A of different one exemplary embodiment (Fig. 6 b-Fig. 6 c) according to prior art for diagram.
Fig. 7 a-Fig. 7 b is that diagram is according to the BS of the system of one exemplary embodiment and there is not (a schematic diagram of the coverage of the different districts of the BS of Fig. 7 a) and while there is (Fig. 7 b) train.
Fig. 8 is that diagram is according to the BS of the system of one exemplary embodiment and along with the schematic diagram of train along the coverage of the different districts of the BS of rail moving.
Fig. 9 is that diagram is according to the flow chart of the process in the node in the communication system of one exemplary embodiment.
Figure 10 is that diagram is according to the block diagram of the layout in the node in the communication system of one exemplary embodiment.
Figure 11 is that diagram is according to the flow chart of the process in the mobile terminal in the communication system of one exemplary embodiment.
Figure 12 is that diagram is according to the block diagram of the layout in the mobile terminal in the communication system of one exemplary embodiment.
Figure 13 is that diagram is according to the block diagram of the layout of one exemplary embodiment.
Embodiment
Describe tout court, provide a kind of for avoiding using the solution of the interference between the system of adjacent frequency band.This solution is dynamic, and for example therefore allows compared to the improvement utilization of the bandwidth resources of prior art solution.The solution providing comprises the actual activity based in adjacent frequency band and the dynamic adaptation of the outer amount of disturbing of the band that generates.Employing can be described as using the system of adjacent frequency band to keep " dynamic disturbance surplus " and/or being described as creating to using " the temporary protection wave band " of the system of adjacent frequency band according to the system of the method for one exemplary embodiment and layout.
In this document, express " upset system " by the system as referring to the outer interference of band that is generated to adjacent frequency band.In addition, express " being subject to upset system " and will be generated to the associated system of the frequency band of interference wherein as referring to upset system.Be subject to upset system not need the interference generating according to letter ground multilated system to upset.In addition, two " vicinity " frequency bands can or can not separated by certain other frequency band, and remain contiguous.
The intelligible example of appearance that can adopt the solution of suggestion is for example at the base station " BS of cellular communication system " A "
a" in, base station " BS wherein
a" be located close in the geographic area of airport or rail track, as illustrated in Figure 1, the frequency band that wherein cellular communication system " A " is used is adjacent to the frequency band that aircraft or train communication/control system are used.Activity in aircraft or train communication/control system is closely related by existing of the aircraft with landing or taking off or the train passed by.During these periods, most probable will be there is no aircraft or train activity, and therefore there is no the activity in these communication/control system.
Typically, for communication system can generate how many bands outer disturb to exist want sum rule.Yet, in theory, while there is no activity in the aircraft in above example or train communication/control system, due to the activity that does not have to be upset by such interference, and therefore do not need the interference margins to adjacent frequency band, so can allow base station " BS
a" the outer interference of generation " unrestricted " band.By " BS
a" then the outer interference of band that generates can the movable real standard based in aircraft or train communication/control system come adaptive.
In Fig. 2 a, with heavy line, describe the example of the frequency band 202 associated with system " A ".For example, can be system " A " and retain frequency band 202, such as the operator by system " A ", in auction etc., obtained the license for frequency band 202.By fine line (204), describe actual band 204, it is by the communication impact in the system " A " in described frequency band 202.Therefore, the outer interference of band is the shadow region 205 of frequency band 202 outsides, and it comprises the signal energy associated with system " A ".
Therefore, when aircraft or train being detected and approaching, capable of regulating base station " BS
a" in parameter or operating condition so that base station " BS
a" the outer interference of the band that causes of signal post will not upset the communication of described approaching aircraft or train.Base station " BS
a" can obtain the information about the arrival of aircraft or train with various ways.For example, can directly from aircraft/train control system, provide such information, or, base station " BS
a" can be equipped with functional by measuring the signal strength signal intensity for example received, receive the report of the measurement that other node in system A carries out or from the information of aircraft/train communication channel, obtain the information about approaching train/aircraft by decoding.
For example, the position based on for example aircraft or train " B ", from aircraft or train " B " to base station " BS
a" estimated distance, speed and/or the isoparametric knowledge of typical behavior of " B ", one or more the passing a parameter of base station can for example adjusted during section preset time, or adjustment until aircraft or train " B " " moved on " or safe landing.
Base station " BS
a" can be equipped with about base station " BS
a" the outer performance of band how to depend on that (or influenced in) is about the information of the adjustment of the different parameters of radio communication.Access such information and make base station " BS
a" energy " optimization " adjustment, adjust the combination of parameter or parameter so that provide band the outer the best possibility performance that fully reduces and maintain base station communication of disturbing." fully reducing " can be for example that interference is reduced to the reducing of level that meets predefined rule.Diagram and describe respectively can be how adaptive or adjust some examples of interference outside band with dotted line 206 and chain-dotted line 208 in Fig. 2 b.If originate in line 204(Fig. 2 a 205) band described disturbs outward, according to the outer interference of the band of dotted lines 206 can be for example filtering characteristic by the sef-adapting filter in the node in change system " A " complete.According to chain-dotted line describe 208 the outer interference of band can be for example by reducing the delivering power of system node and/or for example by by transmission antenna downward-sloping complete associated with described node.
Other example of the parameter that can consider when determining which kind of degree is which (which) parameter will adjust and will adjust to is for example the mobile terminal of the base station service in coming into question or the quantity of UE, and the power requirement of the described UE that draws of the service that utilizes of with good grounds distance from base station to UE and/or UE.
In addition, the node when disturb cellular communication system " A " by adjustment in is (such as for example BS
a) in operating condition or parameter while coming wearing band to disturb outward, can consider the characteristics of signals (using such as for example interfered with system bandwidth and/or frequency) of interfered with system.Consider that the characteristics of signals of interfered with system may affect size or the scope of dynamic disturbance surplus or temporary protection wave band.Because the dynamic disturbance surplus of the interfered with system to possible will be only needed wide like that under precondition, therefore, this will cause the efficient use of radio resource with other side the solution of advising.
In addition, can use the knowledge of interfered with system characteristic and interim and geographical situation for example, to reduce the degeneration of mobile system (LTE).As example, the interfered with system of given position can be processed certain and repeat for example, the high interference from mobile system in (, every 1 ms, every X ms etc.).For example, (or " being injured ") system that is disturbed can be used error correcting code, and (it can compensate short timing error pulse so that the systematic function of being injured is not affected by such pulse; Or the system of being injured can for example be used certain TDM scheme and not connect constantly.
Can realize by different modes for the outer interference of band of the current active in the system of use adjacent frequency band and condition or the adaptation of " disturb and leak ".For example, can carry out by for example antenna tilt or redirect/relocation method of other wave beam the antenna mode of the one or more nodes in adaptive upset system dynamically.When such vehicle and/or terminal being detected in region, can redirect main or central antenna wave beam and for example create, towards the interference of for example being upset one or more entities (, approaching aircraft, train or UE) of system to avoid.For example by inclined antenna, change antenna mode and will change the power of the outer transmitting of band that arrives certain geographic area, this is a kind of possible mode realizing the dynamic disturbance surplus of interfered with system.
Alternatively or in addition, can change provisionally or the delivering power of adaptive one or more nodes dynamically, so that realize suitable interference margins.Yet such adaptation should complete in a controlled manner, for example, so that do not have the signal covering outside of the node of UE in coming into question to be suddenly " discarded " aspect signal.For example, while, disturbing, the UE that is difficult to continue to serve for example can be switched to other node (load is shared) for continuing service outside should reducing band.The example that illustrates such load shared mechanism in Fig. 8, it will be described further below.
Fig. 3-Fig. 6 c schematically illustrates the frequency spectrum of ideal/actual conveyer and the frequency spectrum of the ideal/actual receiver in system B as application system A during according to an embodiment of the invention for the distinct methods of interference reduction.
Desirable conveyer in Fig. 3 system shown A and the frequency spectrum of the desirable receiver in system B.In Fig. 3, in illustrated this ideal situation, there is no inter-system interference.Yet, the actual situation of diagram in Fig. 4 a, Fig. 4 a also illustrates the selectivity of the emission spectrum of frequency dependence and the frequency dependence of actual receiver of actual conveyer.In Fig. 4 a in illustrated situation, inter-system interference has conveyer and caused two relative large contributions of imperfect behavior in receiver.The power spectrum of Fig. 4 b and Fig. 4 c diagram conveyer of system A when applying respectively that dynamic bandwidth reduces (Fig. 4 b) and dynamic power reduces (Fig. 4 c) and so mutual inter-system interference how to change.Another alternative meeting is aggregate bandwidth and power reduction (not shown).As found out when comparison diagram 4a-Fig. 4 c, the shadow region that the diagram in Fig. 4 b and Fig. 4 c is disturbed is less than Fig. 4 a significantly.In addition, in this example, seem dynamic power reduce be than dynamic bandwidth, reduce more efficient alternative.Yet, optimum disturb reduce the selection of measuring can be except depending on actual conveyer and receiver characteristic, also depend on other factors (for example such as, the position of the UE in community (for example, approach cell boarder or approach BS)).
Fig. 5 a-Fig. 5 c is shown in a part for illustrated content in Fig. 4 a-Fig. 4 c, and the dynamic bandwidth of the inter-system interference towards system B that the imperfect conveyer in system A produces and the conveyer of system A reduces (5b)/dynamic power and reduces (5c) impact on the described interference from system A to system B.On the other hand, Fig. 6 a-Fig. 6 c diagram reduces (6b)/dynamic power by the inter-system interference from system A towards system B of imperfect receiver generation of system B and the dynamic bandwidth of the conveyer of system A and reduces (6c) impact on described interference.
Each BS of a plurality of BS(of Fig. 7 a-Fig. 7 b diagram the first system generates a plurality of communities as illustrated in circle) and list the train rail 702 of process, this train is communicated by letter by the neighbor systems of second frequency position.Therefore in Fig. 7 a, there is no train, and the first system can be transmitted resource and used maximum.Yet, in Fig. 7 b, there is train, and by dynamically reducing BS2 in community other BS(BS3 and BS4) by their covering dynamically expand to cover by BS2 make reduce compared with large region, consider second system and adaptive the first system.
Fig. 8 diagram is as illustrated in dotted line has three base stations in the communication system of lasting antenna lobe or wave beam conventionally.As found out in Fig. 8, the direction of these lasting beam position train rails.When application is during one exemplary embodiment of the present invention, if train approaches, the main lobe (wave beam) that approaches most base station BS 1 is adjusted to interim wave beam, to do not produce the interference of communicating by letter between train control system and train.The interim wave beam of these new adaptations is illustrated by heavy line in Fig. 8.When the wave beam (for example, by redirecting or reconfiguring) of adaptive BS1, the wave beam of capable of regulating neighbor base stations BS2, so that the adaptation covering due to the wave beam of BS1 departs from the region of covering.For example,, when the wave beam 802N(of BS1 dotted line) be fitted to wave beam 802T(solid line) so that while avoiding disturbing with train communication system, UE 806 is positioned at the outside of the covering of BS1.Yet in order to continue to provide service to UE 806, the wave beam 804N of BS2 is fitted to wave beam 804T, and the service of UE 806 is transferred to BS2(load and shares).When train is through out-of-date, the wave beam of BS1 and BS3 will be got back to normally (802N, 804N).When train is during along rail moving, can there is the similar adjustment of other wave beam.
The use of adaptive antenna pattern and/or the dynamic change of delivering power can be with the outer frequency spectrum disturbing or the combination of actions of frequency content with for example adjustment.In addition, the use of adaptive antenna pattern can be improved the possibility of improving the throughput in LTE with COMP; The community for example with the bandwidth of interim minimizing obtains the more branched of utilized bandwidth to hold from neighbor cell.
In addition, sef-adapting filter can be used for realizing the dynamic response to produced disturbed condition.For example can come with the one or more sef-adapting filters in upset system according to being upset the characteristic of system and being subject to the activity in upset system and inhibition zone is disturbed outward.Due to for example, by using the band of the increase of sef-adapting filter to disturb inhibition outward, upset the performance of system and can degenerate a little.For example, by such inhibition, can make to upset the signal quality degradation in intrasystem communication.Yet, when relatively reduce to disturb available alternative attainable effect time, in certain situation, sef-adapting filter can remain preferred solution.
The LTE BS that is positioned at the geographic area that approaches airport and/or train rail/track may be configured with receiver to detect the signal from aircraft and/or train.Once the signal from aircraft or train be detected, can apply temporary protection wave band, it depends on the distance of aircraft/train and is dynamically adjusted.Received signal strength can be used to be estimated to this distance of aircraft/train.The distance of the estimation between LTE BS and aircraft or train of take is basis, can estimate the bandwidth of temporary protection wave band.In the situation that there is number of users in the community of low radio link quality lower than therefore meaning seldom or there is no user away from BS to determined number N(), LTE BS can reduce its DL delivering power during preset time.
Be arranged in the LTE BS of the geographic area that approaches airport or train rail can be for example via cable or via microwave link with airport control tower or with the traffic controller direct communication of aircraft or train so that LTE BS can obtain the information to the distance of LTE BS about the arrival of aircraft and they.Based on this information, these BS can apply temporary protection wave band or interim power reduction.
Realize the LTE BS of the above-mentioned first and/or second embodiment for example can application load balancing technique to guide a part of cell load into neighbor cell, the control BS of this neighbor cell does not disturb with aircraft or train during the time period of application temporary protection wave band.
The interim modification that realizes system bandwidth can require to need to solve to reduce some produced practical problems by temporary system bandwidth.Such problem is channel estimating.For example, some adjustment or interpolation that can be to standard criterion.For example, if the system operating in 20 MHz frequency channels is adjusted to temporarily, in 18 MHz frequency channels, operate, reduced the quantity of available Physical Resource Block (PRB).Therefore, should find out that for example DL PDCCH can suitably be carried in the PRB of remaining amount.Such as 3GPP(third generation partner program) etc. tissue can for example need the PRB regulation performance requirement of for this reason new amount.
During bandwidth of operation in revising community, the information of this modification should be offered to the mobile terminal for example quartering on this community, and offer the base station (at least in due course) in neighbor cell.Can via the broadcast channel of for example community, come to notify the change in bandwidth of operation to described mobile terminal.Can notify the base station in neighbor cell via for example X2 or S1 interface.
In the first one exemplary embodiment, the LTE base station that approaches airport or train rail/track once detect approaching aircraft or train for example the time period "
td" in the interim bandwidth that reduces them.It reduces their bandwidth of operation provisionally such LTE BS() notify user in their community about for example in period
tdthe upper part of DL LTE bandwidth will do not used during this time.This notice can or complete via explicit signaling via broadcast.One receives such message, and the UE in affected cells can prevent in the time period
tdto being not used in the wave band of transmission, partly carry out RSRP(Reference Signal Received Power during this time), RSRQ(Reference Signal Received Quality) measurement and/or RSSI(received signal strength indicator symbol) measure.Described UE also can prevent the CQI carrying out in this wave band part to measure.If likely, can carry out at least some in described measurement on the neighbor cell of frequency band of not limiting in a similar fashion them.For example, given community A(wherein bandwidth from 20 MHz, reduce to 18 MHz temporarily) have N neighbours.One of them neighbours B is also restricted to 18 MHz from 20 MHz by its bandwidth in a similar fashion.Another in N neighbours (neighbours C) do not limit its bandwidth, therefore (or because for example different distance to interfered with system causes the Yi Yu community A mode different with B to limit its bandwidth), and community C has community A and B(due to their limit bandwidth) activity in obsolete bandwidth.Then, quarter at UE on the A of community and for example can measure for example from the RSRP of 18MHzShang community A and B, and identical UE can measure the RSRP of comfortable whole 20 MHz bandwidth Shang community C.Identical mode is applicable to RSRQ, RSSI.
In the second embodiment of the present invention, the grand eNB with bandwidth restricted to the UE broadcast PDCCH in their community not the upper wave band of utilized bandwidth carry out channel allocation.
In the third embodiment of the present invention, do not give according to the user assignment of the semi-persistent scheduling in DL (SPS) strategy scheduling temporarily or permit the resource in this temporary protection wave band.
In LTE, for example the eNB by service UE should carry out the bandwidth of measurement thereon to the UE in described UE regulation community.The parameter that this standard is referred to as " AllowedMeasBandwidth " by use is made, and this parameter is at system information block 3(SIB3) in broadcast, as can be seen in 3GPP TS 36.331 for example.Yet parameter " AllowedMeasBandwidth " can 6,12,25,50 and 100 RB of an assumed value.Therefore, only have the RB of these alternative quantity to can be used for measuring.In addition, these RB are centered by central RB.
Option is used existing signaling by being and without any modification.For example, consider to have the community that approaches airport of 20 MHz bandwidth (100 RB).One detects aircraft approaches, and just determines to use 17.5 MHz in available bandwidth.Last 2.5 MHz of the top/upper frequency of bandwidth are as temporary protection wave band.During period when 17.5 MHz in only having 20 MHz will transmit for data, can be at a central 10 MHz(50 RB) in carry out and measure.This option has the limited shortcoming of big or small granularity of temporary protection wave band.Owing to carrying out in the frequency of measuring in channel width in the heart, so protection wave band must always be less than/be narrower than channel width half.
In the situation that requiring more fine granulation, can will newly be worth (for example 94 and/or 88 RB) and add to the list of the permissible value of " AllowedMeasBandwidth ".In addition, it can stipulate except some other RB(92 RB of central authorities for example, first 94 RB) should be for measuring, so last 6 RB are not used temporarily.
Another option will be increase Delta (delta) (
dlt) to existing measurement configuration.As example, above-mentioned in the situation that, the value of dlt can equal i.e. 12 RB of 2.5 MHz(), it is removed the top wave band from bandwidth.
In the situation that the temporary protection wave band in these wave bands and interim power reduction combination can complete the signaling about Measurement bandwidth via special RRC signaling.
When UE receives about the position of temporary protection wave band and big or small information, adaptive measurement.This means at this
tdmeasurement bandwidth during period can not surpass the maximum bandwidth of the operation during the phase at this moment, and for example RSRP or RSRQ measure and can in the maximum bandwidth of operation up to during the phase at this moment, complete.Any other band width configuration lower than bandwidth of operation is all possible.Should be on all available bandwidths measure channel state information (CSI).Same way is applicable to demodulation.Phase at this moment
tdending, UE gets back to its initial configuration.
example procedure in node, Fig. 9
Referring now to Fig. 9, describe for avoiding or reduce the one exemplary embodiment of process of the interference of adjacent frequency band.This process will be carried out or be carried out by this network node in network node (such as for example, the base station in the first wireless communication system or other node).Suppose that the first frequency band that the first communication system (being also referred to as " upset system ") operates therein with it is associated.Suppose that the second that the second wireless system operates therein with it, to be adjacent to the first frequency band frequency band is associated.The first and second frequency bands can be separated by the 3rd not associated with first or second system frequency band.
The first communication system can be the system by the first operator or tissue manipulation, such as the WCDMA for example of UMTS(for example), LTE or LTE-A.Second system can be " special use " wireless communication system, and such as example DME as mentioned previously, L-DACS or GSM-R, it is communicated by letter and control for aircraft and train.Second system can be alternatively for example, by the system of the second operator or tissue manipulation, UMTS, LTE or LTE-A.Second system is radar system also, comprises and for example generates the fixing node geographically that rotates/strafe radar beam; Broadcast system or satellite-based system.The first and second systems are associated with adjacent frequency band, and that communication in the first system in the frequency band associated with the first system can cause the interference in the frequency band associated with second system, and therefore can with second system in Communication Jamming.
At first, in the network node in the first system, the activity of the second system in the second frequency band in action 902, detected.In order to detect such activity, network node can for example be monitored the second frequency band or be received for example, report about such measurement of certain (some) other nodes (UE) execution in the first system by the signal energy of measuring in described the second frequency band; And/or, the information that receives and decode and transmitted by the second system in described the second frequency band.Alternatively or in addition, network node can receive about the movable information in the second frequency band.Such information can be for example provided by alternative communication link (such as for example, microwave link or via wire communication) by second system.The information being provided by second system can be about for example with lower one or more: the geographical position of the one or more mobile nodes in second system; The Move Mode of the one or more nodes in second system, the timetable of the node in second system and the receiver characteristic of the one or more nodes in second system.
An example of receiver characteristic is blocking ability.For example, given receiver can process/reduce/cut off for example, the interference up to 60 dB from neighbours' frequency band (1.25 MHz distance), and another receiver can be so not powerful and be merely able to cut off/remove the interference from 40 dB levels of identical neighbours' frequency band.The information about being disturbed (second) system like this can be known for (first) system of interference, so that EVAC (Evacuation Network Computer Model) can be determined the proper level that bandwidth for example and/or delivering power reduce.
According to for example one or more information of obtaining in the above described manner, network node can detect the activity of the second system in the second frequency band.Then in action 904, for example, by the analysis of performed measurement or other information of obtaining, determine the characteristic of the current active in the second frequency band.
Therefore, during the characteristic of the current active of the second system in determining the second frequency band, can in optional action 906, determine by the communication associated with network node (, from the DL of network node and/or to the UL of network node) whether disturb according to the characteristic of the current active of the second system in the second frequency band outside the band that produces, or noly should reduce or can (in allowing border) increase the outer interference of band.Herein " according to " mean that the outer interference of band that the outer interference of band meets from the first system can interfere with second system the predefined requirement of which kind of degree, and simultaneously, the radio resource in the first system is for example used to fully high degree or high as far as possible degree.That is, be with outer interference not high enoughly or enough to arrive by force and second system moving obstacle, but also should be suppressed to unnecessary low level.
Therefore, in due course, in action 908, adjust by node the bandwidth for radio communication, so that the second system that the interference from the radio communication associated with network node to the second frequency band is adapted to described the second frequency band is movable.In addition, in action 910, at least one mobile terminal of being served by node, provide the information of adjusting about bandwidth, therefore allow described at least one mobile terminal to continue serviced.
The designator that can comprise the Measurement bandwidth of the permission for mobile terminal that the bandwidth based on adjusting is selected about the information of bandwidth adjustment.This information also can comprise the standard of position of the Measurement bandwidth of permission.
In action 912, node also can for example provide via X2 or S1 interface the information of adjusting about bandwidth to neighbor node (such as for example BS).
exemplary arrangements in node, Figure 10
Below, with reference to Figure 10, describe to be adapted to and allow the exemplary arrangements 1000 of performance of avoiding or reducing the process of the interference in adjacent frequency band described above.This layout is adapted in network node 1001 (such as base station or other node in associated the first communication system of the first frequency band for example operating therein with the first system) and uses and be illustrated as and be arranged in/be integrated in this network node 1001.Arrange that 1000 are further illustrated as that it can be regarded as comprising the legacy device for wireless and/or wire communication via communication unit 1002() with other entity communication.This layout and/or node also can comprise other functional unit 1014, such as for example sef-adapting filter, antenna controlling mechanism and/or the functional unit of conventional base station functions (such as for example service mobile terminal) is provided.This layout and/or node also can comprise one or more memory cell 1012.The first and second systems can have all kinds, as in the past in conjunction with as described in Fig. 9.
Arrange that 1000 comprise detecting unit 1004, it is adapted to the activity that detects the second system in the second frequency band that is adjacent to the first frequency band.For example, detecting unit can be adapted to by measuring the signal energy in described the second frequency band; By the information that receives and decode and transmitted by the second system in described the second frequency band; Alternatively receive or retrieval for example, is monitored the second frequency band about the movable information in the second frequency band (this information can for example pass through alternative communication link (, microwave link or via wire communication link) and receive or retrieve from second system).
Arrange and also comprise determining unit 1006, it is adapted to the characteristic of the current active of determining the second system in the second frequency band.Described characteristic for example can relate to lower one or more: the frequency by second system for transmitting and/or receiving, and to which kind of degree; Expectation is carried out the movable time period; Movable expectation development; Movable periodicity; And movable geographic range." expectation development " can relate to factors such as the modulation format such as being used by second system or modulation concept.
Arrange that (for example determining unit 1006 or selectable unit that some are additional) also can be adapted to the characteristic of the second system activity in given the second frequency band and determine whether the interference of the second frequency band is met to predefined requirement.Predefined criterion can be about the acceptable level of the interference in the frequency in the second frequency band, and it is subject to the impact of second system activity.Predefined criterion for example the permission level based on about with outer interference rule and/or based on for example negotiation result between different operators.Such adjusting can be leaked than (ACLR) about " blocking-up " and/or adjacent channel.For example, for the access of HSPA(high-speed packet) and LTE, can in 3GPP standard, find the information about such permission level.
Therefore, this layout can be adapted to and adjust bandwidth so that when determining that interference does not meet predefined criterion and the interference of minimizing to the second frequency band during therefore with the movable potential interference of second system; And adjust bandwidth so that when determining that interference maintains while meeting predefined criterion or increases the interference to the second frequency band.
This layout also comprises adjustment unit 1008, and it is adapted to based on described characteristic and adjusts the bandwidth for radio communication by network node, so that the second system that the interference of the second frequency band is adapted in described the second frequency band is movable.This layout also comprises provides unit 1010, is adapted to at least one mobile terminal of being served by node the information of adjusting about bandwidth is provided, and therefore allows described at least one mobile terminal to continue serviced.For example can provide this information via broadcast channel and/or via dedicated signaling.In addition, this layout (unit is for example provided) can be adapted to at least one adjacent node (such as for example, the BS in neighbor cell) information of adjusting about bandwidth is provided.For example can provide such information via X2 interface or S1 interface.
When notified such bandwidth is adjusted, neighbor node also can indicate the UE being served by described neighbor node to make adjustment to the bandwidth of described UE execution measurement (the especially measurement of RSSI).That is, can indicate UE for example only at the upper RSSI of measurement of a part of system bandwidth (rather than whole system bandwidth).If community A(is for this community A; bandwidth of operation is for example limited temporarily to 18 MHz from 20 MHz) some neighbor cells do not limit their bandwidth of operation; meeting is carried out the UE measuring and can be changed at another execution measurement on " not limited " neighbor cell on present interim limited community conventionally, is at least the part bandwidth for or " loss " limited at A place, community.
For example depend on preference, above-mentioned functions unit available software and/or hardware are realized.
example procedure in mobile terminal, Figure 11
Referring now to Figure 11, describe for supporting and allow to avoid or reduce the one exemplary embodiment of process of the interference of adjacent frequency band.This process will carry out/be carried out by this mobile terminal or UE in the mobile terminal in the first wireless communication system or UE.As above described in conjunction with Figure 9, suppose that the first frequency band that the first communication system (being also referred to as " upset system ") operates therein with it is associated.Suppose that the second frequency band that is adjacent to the first frequency band that the second wireless system operates therein with it is associated.The first and second frequency bands can be separated by the 3rd not associated with first or second system frequency band.The former description of the other characteristic of the first and second systems.
Reception information in action 1102.This information receives from the node of service mobile terminal, and about the adjustment for the bandwidth of communicating by letter by described node.Then, in action 1104, the information based on received is carried out adaptive at least one parameter about channel estimating.At least one parameter of adjusting can be that for example mobile terminal is for example carried out the Measurement bandwidth that the RSRP/RSRQ/RSSI for channel estimating measures, and/or the position of Measurement bandwidth.
exemplary arrangements in mobile terminal, Figure 12
Below, with reference to Figure 12, describe and be adapted to the exemplary arrangements 1200 of performance that allows support described above to avoid or reduce the process of the interference in adjacent frequency band.This layout is adapted at base station or other node in the first associated communication system of mobile terminal 1201(such as the first frequency band for example operating therein with the first system) in use and be illustrated as and be arranged in/be integrated in this mobile terminal 1201.This layout 1200 is further illustrated as that it can be regarded as comprising the legacy device for radio communication via communication unit 1202() with other entity communication.This layout and/or mobile terminal also can comprise other functional unit 1210, such as for example sef-adapting filter, antenna controlling mechanism and/or the functional unit of conventional base station functions (such as for example service mobile terminal) is provided.This layout and/or mobile terminal also can comprise one or more memory cell 1208.The first and second systems can have all kinds, as in the past in conjunction with as described in Fig. 9.
This layout 1200 comprises acquiring unit 1204, is adapted to the information for the adjustment of the bandwidth of communicating by letter about the node by service mobile terminal that receives.This information can be provided by the node of service mobile terminal, and therefore from this node, receives, and this service node has been adjusted the bandwidth of its communication/operation.As former, mentioned, can be for example by the form of the parameter of " AllowedMeasBandwidth " in similar for example SIB, provide this information.Alternatively, this information can be included in the explicit indication of the bandwidth of operation after bandwidth adjustment, or is provided as the delta value of for example indicating the bandwidth of recalling from primitive operation bandwidth.
This layout also comprises adaptation unit 1206, and the information being adapted to based on received is carried out adaptive at least one parameter about channel estimating.As former, mentioned, capable of regulating is used for carrying out the bandwidth of measurement (for example RSRP, RSRQ and/or rssi measurement) by mobile terminal, so that be not not used in the frequency of communication and carry out and measure at service node.
For example depend on preference, above-mentioned functions unit available software and/or hardware are realized.
exemplary arrangements, Figure 13
The embodiment of the layout 1300 in the schematically illustrated network node of Figure 13 or mobile terminal, it can be to be also disclosed in the layout in illustrated network node in Figure 10 or the alternate ways of the embodiment of the layout in illustrated mobile terminal in Figure 12.Be included in herein and arrange to be processing unit 1306 in 1300, for example, there is DSP(digital signal processor).Processing unit 1306 can be the difference action that process described herein is carried out in individual unit or a plurality of unit.Arrange that 1300 also can comprise that input unit 1302 is for receiving signal from other entity, and output unit 1304 is for providing signal to other entity.Input unit 1302 and output unit 1304 can be arranged to integrated entity.
In addition, arrange that 1300 comprise at least one computer program 1308 of the form that adopts nonvolatile memory, this nonvolatile memory can be for example EEPROM(Electrically Erasable Read Only Memory), flash memory and hard drives.Computer program 1308 comprises computer program 1310, it comprises code components, while carrying out in its processing unit 1306 in layout 1300, make layout and/or network node or mobile terminal carry out the action of the above process in conjunction with corresponding Fig. 9 and Figure 11 description.
If change into reference to Figure 13 and describe the one exemplary embodiment for the layout of mobile terminal, arrange that code components in 1300 computer program 1310 comprises that acquisition module 1310a is for receiving the information for the adjustment of the bandwidth of communicating by letter about the node by service mobile terminal.Computer program also comprises that adaptation module 1310b carrys out adaptive at least one parameter about channel estimating for the information based on received.In addition, in this example, computer program can comprise that other module (for example 1310c-e) is for providing other desirable function.
Although above in conjunction with Figure 13 the code components in disclosed embodiment be embodied as when carry out in processing unit, make to arrange and/or network node carry out more than the computer program module of the action of description by reference to the accompanying drawings, at least one in code components can be embodied as at least in part hardware circuit in alternative.
Processor can be single cpu (CPU), but also can comprise two or more processing unit.For example, processor can comprise general purpose microprocessor; Instruction set processor and/or relevant chipset and/or special microprocessor (for example ASIC(application-specific integrated circuit (ASIC))).Processor also can comprise that main board memory comes for high-speed cache object.Computer program can be carried by the computer program that is connected to processor.Computer program can comprise the computer-readable medium of storing computer program thereon.For example, computer program can be flash memory, RAM(random access memory), ROM(read-only memory) or EEPROM, and above-mentioned computer program module can be distributed on different computer programs by the form of the memory in network node in alternative.
Although describe the process of advising as above with reference to the specific embodiment that is provided as example, but describe, be conventionally only intended to that inventive concept is described and should not be construed as method that restriction advises and the scope of layout, this scope is defined by appended claim.Although describe with general terms, but method with for example arrange, applicable to for example using different power and/or the dissimilar communication system of bandwidth, WCDMA, LTE, LTE-A, the WiMAX(World Interoperability for Microwave Access, WiMax of use of the conventionally available communication technology), GSM, UMTS, radar system, satellite system or broadcast technology.
Will also be understood that, the selection of interactive unit or module and the name of unit be just for the object of demonstrating, and the client and server node that is suitable for carrying out above-mentioned any method can configure to can carry out advised process action by a plurality of alternate ways.
Should also be noted that the unit described or module will be regarded as logic entity and unnecessaryly be regarded as independent physical entity in the disclosure.
Claims (11)
1. with a method in node for the associated the first system of the first frequency band of radio communication, for avoiding or the interference of the second frequency band that minimizing is associated with second system and be adjacent to described the first frequency band, described method comprises:
The activity of the described second system in-detection (902) described second frequency band,
The characteristic of the current active of the described second system in-definite (904) described second frequency band,
-based on described characteristic adjust (908) by described node for the bandwidth of communicating by letter so that the described second system that the interference from the radio communication associated with described node to described the second frequency band is adapted to described the second frequency band is movable,
-at least one mobile terminal of being served by described node, provide (910) information about described bandwidth adjustment, therefore allow described at least one mobile terminal to continue serviced.
2. method according to claim 1, wherein comprises one or more in following about the described information of described bandwidth adjustment:
The designator of the Measurement bandwidth being allowed to of-described mobile terminal based on selecting through the bandwidth of adjusting,
-after described adjustment by described node the designator for the bandwidth of communicating by letter,
The designator of the absolute or relative changes of-bandwidth.
3. method according to claim 2, wherein the described information about described bandwidth adjustment also comprises the standard with lower one or more position:
-described in the Measurement bandwidth that is allowed to,
-after described adjustment, by described node, be used for the bandwidth of communicating by letter, and
-after described bandwidth adjustment, will no longer by described node, be used for the frequency band of communicating by letter.
4. according to the method described in any one in the claims, wherein the information about described bandwidth adjustment is provided at least one neighbor node, so that described neighbor node can provide the information of adjusting about described bandwidth at least one mobile terminal of being served by described neighbor node, therefore allow described at least one mobile terminal to continue serviced.
5. with a method in mobile terminal for the associated the first system of the first frequency band of radio communication, for supporting to avoid or the interference of the second frequency band that minimizing is associated with second system and be adjacent to described the first frequency band, described method comprises:
-from serving the node of described mobile terminal, receive (1102) about the information for the adjustment of the bandwidth of communicating by letter by described node, and
-information based on received comes adaptive (1104) about at least one parameter of channel estimating.
6. method according to claim 5, wherein said at least one adaptive parameter is with lower one or more:
-Measurement bandwidth, described mobile terminal is carried out the measurement for channel estimating therein,
The position of-described Measurement bandwidth.
7. a layout (400) of using in the node with for the associated the first system of the first frequency band of radio communication (401), for supporting to avoid or the interference of the second frequency band that minimizing is associated with second system and be adjacent to described the first frequency band, described layout comprises:
-detecting unit (1004), is adapted to the activity that detects the described second system in described the second frequency band,
-determining unit (1006), is adapted to the characteristic of the current active of determining the described second system in described the second frequency band, and
-adjustment unit (1008), is adapted to based on described characteristic and adjusts the bandwidth for communicating by letter by described node, so that the described second system that the described interference of described the second frequency band is adapted in described the second frequency band is movable, and
-unit (1010) is provided, be adapted to at least one mobile terminal of being served by described node the information of adjusting about described bandwidth is provided, therefore allow described at least one mobile terminal to continue serviced.
8. layout according to claim 7, wherein the information about described bandwidth adjustment is provided at least one neighbor node.
9. a base station, comprises according to the layout described in claim 7 or 8.
10. a layout (1200) of using in the mobile terminal with for the associated the first system of the first frequency band of radio communication (1201), for supporting to avoid or the interference of the second frequency band that minimizing is associated with second system and be adjacent to described the first frequency band, described layout comprises:
-acquiring unit (1204), is adapted to the information for the adjustment of the bandwidth of communicating by letter about the node by the described mobile terminal of service that receives,
-adaptation unit (1206), the information being adapted to based on received is carried out adaptive at least one parameter about channel estimating.
11. 1 kinds of mobile terminals (1201), comprise layout according to claim 9.
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Also Published As
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| US10154418B2 (en) | 2018-12-11 |
| WO2012158077A1 (en) | 2012-11-22 |
| EP2710827A1 (en) | 2014-03-26 |
| EP2710827A4 (en) | 2015-11-18 |
| EP2710827B1 (en) | 2019-02-27 |
| US20140094165A1 (en) | 2014-04-03 |
| CN103650562B (en) | 2019-04-30 |
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